Prólogo

Después de instalar una extensión de navegador anti-XSS, Stack Snippets dejó de funcionar repentinamente en toda la red de Stack Exchange. ¡Ya no podía aprender de Stack Overflow , ver demostraciones de trabajo sobre la experiencia del usuario y, lo peor de todo, no podía probar las respuestas de JavaScript en Programming Puzzles y Code Golf ! Desesperadamente busqué un remedio y encontré un pequeño cuadro de entrada en la configuración, en el que podía colocar una sola expresión regular. No cabía en todos los sitios de Stack Exchange en este pequeño cuadro, así que pedí ayuda. Esta es esa pregunta.

Tarea

Su tarea es crear una expresión regular que coincida con todas las URL del sitio web de Stack Exchange, sin que coincida ningún dominio que no sea propiedad de Stack Overflow Inc ..

Su expresión regular debe coincidir con todas las URL con las siguientes partes:

• protocol: esto será http://o https://.

• domain: este será un elemento de esta lista:

  stackoverflow.com
  www.stackoverflow.com
  facebook.stackoverflow.com
  serverfault.com
  superuser.com
  meta.stackexchange.com
  webapps.stackexchange.com
  nothingtoinstall.com
  meta.webapps.stackexchange.com
  meta.nothingtoinstall.com
  gaming.stackexchange.com
  arqade.com
  thearqade.com
  meta.gaming.stackexchange.com
  meta.arqade.com
  meta.thearqade.com
  webmasters.stackexchange.com
  webmaster.stackexchange.com
  meta.webmasters.stackexchange.com
  meta.webmaster.stackexchange.com
  cooking.stackexchange.com
  seasonedadvice.com
  meta.cooking.stackexchange.com
  meta.seasonedadvice.com
  gamedev.stackexchange.com
  meta.gamedev.stackexchange.com
  photo.stackexchange.com
  photography.stackexchange.com
  photos.stackexchange.com
  meta.photo.stackexchange.com
  meta.photography.stackexchange.com
  meta.photos.stackexchange.com
  stats.stackexchange.com
  statistics.stackexchange.com
  crossvalidated.com
  meta.stats.stackexchange.com
  meta.statistics.stackexchange.com
  math.stackexchange.com
  maths.stackexchange.com
  mathematics.stackexchange.com
  meta.math.stackexchange.com
  diy.stackexchange.com
  meta.diy.stackexchange.com
  meta.superuser.com
  meta.serverfault.com
  gis.stackexchange.com
  meta.gis.stackexchange.com
  tex.stackexchange.com
  meta.tex.stackexchange.com
  askubuntu.com
  ubuntu.stackexchange.com
  meta.askubuntu.com
  meta.ubuntu.stackexchange.com
  money.stackexchange.com
  basicallymoney.com
  www.basicallymoney.com
  meta.money.stackexchange.com
  english.stackexchange.com
  elu.stackexchange.com
  meta.english.stackexchange.com
  stackapps.com
  ux.stackexchange.com
  ui.stackexchange.com
  meta.ux.stackexchange.com
  meta.ui.stackexchange.com
  unix.stackexchange.com
  linux.stackexchange.com
  meta.unix.stackexchange.com
  meta.linux.stackexchange.com
  wordpress.stackexchange.com
  meta.wordpress.stackexchange.com
  cstheory.stackexchange.com
  meta.cstheory.stackexchange.com
  apple.stackexchange.com
  askdifferent.com
  meta.apple.stackexchange.com
  rpg.stackexchange.com
  meta.rpg.stackexchange.com
  bicycles.stackexchange.com
  bicycle.stackexchange.com
  cycling.stackexchange.com
  bikes.stackexchange.com
  meta.bicycles.stackexchange.com
  meta.bicycle.stackexchange.com
  programmers.stackexchange.com
  programmer.stackexchange.com
  meta.programmers.stackexchange.com
  electronics.stackexchange.com
  chiphacker.com
  www.chiphacker.com
  meta.electronics.stackexchange.com
  android.stackexchange.com
  meta.android.stackexchange.com
  boardgames.stackexchange.com
  boardgame.stackexchange.com
  meta.boardgames.stackexchange.com
  physics.stackexchange.com
  meta.physics.stackexchange.com
  homebrew.stackexchange.com
  homebrewing.stackexchange.com
  brewadvice.com
  meta.homebrew.stackexchange.com
  meta.homebrewing.stackexchange.com
  security.stackexchange.com
  itsecurity.stackexchange.com
  meta.security.stackexchange.com
  meta.itsecurity.stackexchange.com
  writers.stackexchange.com
  writer.stackexchange.com
  writing.stackexchange.com
  meta.writers.stackexchange.com
  video.stackexchange.com
  avp.stackexchange.com
  meta.video.stackexchange.com
  meta.avp.stackexchange.com
  graphicdesign.stackexchange.com
  graphicsdesign.stackexchange.com
  graphicdesigns.stackexchange.com
  meta.graphicdesign.stackexchange.com
  dba.stackexchange.com
  meta.dba.stackexchange.com
  scifi.stackexchange.com
  sciencefiction.stackexchange.com
  fantasy.stackexchange.com
  meta.scifi.stackexchange.com
  codereview.stackexchange.com
  meta.codereview.stackexchange.com
  codegolf.stackexchange.com
  meta.codegolf.stackexchange.com
  quant.stackexchange.com
  meta.quant.stackexchange.com
  pm.stackexchange.com
  meta.pm.stackexchange.com
  skeptics.stackexchange.com
  skeptic.stackexchange.com
  skepticexchange.com
  meta.skeptics.stackexchange.com
  fitness.stackexchange.com
  meta.fitness.stackexchange.com
  drupal.stackexchange.com
  meta.drupal.stackexchange.com
  mechanics.stackexchange.com
  garage.stackexchange.com
  meta.mechanics.stackexchange.com
  meta.garage.stackexchange.com
  parenting.stackexchange.com
  meta.parenting.stackexchange.com
  sharepoint.stackexchange.com
  sharepointoverflow.com
  www.sharepointoverflow.com
  meta.sharepoint.stackexchange.com
  music.stackexchange.com
  guitars.stackexchange.com
  guitar.stackexchange.com
  meta.music.stackexchange.com
  sqa.stackexchange.com
  meta.sqa.stackexchange.com
  judaism.stackexchange.com
  mi.yodeya.com
  yodeya.com
  yodeya.stackexchange.com
  miyodeya.com
  meta.judaism.stackexchange.com
  german.stackexchange.com
  deutsch.stackexchange.com
  meta.german.stackexchange.com
  japanese.stackexchange.com
  meta.japanese.stackexchange.com
  philosophy.stackexchange.com
  meta.philosophy.stackexchange.com
  gardening.stackexchange.com
  landscaping.stackexchange.com
  meta.gardening.stackexchange.com
  travel.stackexchange.com
  meta.travel.stackexchange.com
  productivity.stackexchange.com
  meta.productivity.stackexchange.com
  crypto.stackexchange.com
  cryptography.stackexchange.com
  meta.crypto.stackexchange.com
  meta.cryptography.stackexchange.com
  dsp.stackexchange.com
  signals.stackexchange.com
  meta.dsp.stackexchange.com
  french.stackexchange.com
  meta.french.stackexchange.com
  christianity.stackexchange.com
  meta.christianity.stackexchange.com
  bitcoin.stackexchange.com
  meta.bitcoin.stackexchange.com
  linguistics.stackexchange.com
  linguist.stackexchange.com
  meta.linguistics.stackexchange.com
  hermeneutics.stackexchange.com
  meta.hermeneutics.stackexchange.com
  history.stackexchange.com
  meta.history.stackexchange.com
  bricks.stackexchange.com
  meta.bricks.stackexchange.com
  spanish.stackexchange.com
  espanol.stackexchange.com
  meta.spanish.stackexchange.com
  scicomp.stackexchange.com
  meta.scicomp.stackexchange.com
  movies.stackexchange.com
  meta.movies.stackexchange.com
  chinese.stackexchange.com
  meta.chinese.stackexchange.com
  biology.stackexchange.com
  meta.biology.stackexchange.com
  poker.stackexchange.com
  meta.poker.stackexchange.com
  mathematica.stackexchange.com
  meta.mathematica.stackexchange.com
  cogsci.stackexchange.com
  meta.cogsci.stackexchange.com
  outdoors.stackexchange.com
  meta.outdoors.stackexchange.com
  martialarts.stackexchange.com
  meta.martialarts.stackexchange.com
  sports.stackexchange.com
  meta.sports.stackexchange.com
  academia.stackexchange.com
  academics.stackexchange.com
  meta.academia.stackexchange.com
  cs.stackexchange.com
  computerscience.stackexchange.com
  meta.cs.stackexchange.com
  workplace.stackexchange.com
  meta.workplace.stackexchange.com
  windowsphone.stackexchange.com
  meta.windowsphone.stackexchange.com
  chemistry.stackexchange.com
  meta.chemistry.stackexchange.com
  chess.stackexchange.com
  meta.chess.stackexchange.com
  raspberrypi.stackexchange.com
  meta.raspberrypi.stackexchange.com
  russian.stackexchange.com
  meta.russian.stackexchange.com
  islam.stackexchange.com
  meta.islam.stackexchange.com
  salesforce.stackexchange.com
  meta.salesforce.stackexchange.com
  patents.stackexchange.com
  askpatents.com
  askpatents.stackexchange.com
  meta.patents.stackexchange.com
  meta.askpatents.com
  meta.askpatents.stackexchange.com
  genealogy.stackexchange.com
  meta.genealogy.stackexchange.com
  robotics.stackexchange.com
  meta.robotics.stackexchange.com
  expressionengine.stackexchange.com
  meta.expressionengine.stackexchange.com
  politics.stackexchange.com
  meta.politics.stackexchange.com
  anime.stackexchange.com
  meta.anime.stackexchange.com
  magento.stackexchange.com
  meta.magento.stackexchange.com
  ell.stackexchange.com
  meta.ell.stackexchange.com
  sustainability.stackexchange.com
  meta.sustainability.stackexchange.com
  tridion.stackexchange.com
  meta.tridion.stackexchange.com
  reverseengineering.stackexchange.com
  meta.reverseengineering.stackexchange.com
  networkengineering.stackexchange.com
  meta.networkengineering.stackexchange.com
  opendata.stackexchange.com
  meta.opendata.stackexchange.com
  freelancing.stackexchange.com
  meta.freelancing.stackexchange.com
  blender.stackexchange.com
  meta.blender.stackexchange.com
  mathoverflow.net
  mathoverflow.stackexchange.com
  mathoverflow.com
  meta.mathoverflow.net
  space.stackexchange.com
  thefinalfrontier.stackexchange.com
  meta.space.stackexchange.com
  sound.stackexchange.com
  socialsounddesign.com
  sounddesign.stackexchange.com
  meta.sound.stackexchange.com
  astronomy.stackexchange.com
  meta.astronomy.stackexchange.com
  tor.stackexchange.com
  meta.tor.stackexchange.com
  pets.stackexchange.com
  meta.pets.stackexchange.com
  ham.stackexchange.com
  meta.ham.stackexchange.com
  italian.stackexchange.com
  meta.italian.stackexchange.com
  pt.stackoverflow.com
  br.stackoverflow.com
  stackoverflow.com.br
  meta.pt.stackoverflow.com
  meta.br.stackoverflow.com
  aviation.stackexchange.com
  meta.aviation.stackexchange.com
  ebooks.stackexchange.com
  meta.ebooks.stackexchange.com
  alcohol.stackexchange.com
  beer.stackexchange.com
  dranks.stackexchange.com
  meta.alcohol.stackexchange.com
  meta.beer.stackexchange.com
  softwarerecs.stackexchange.com
  meta.softwarerecs.stackexchange.com
  arduino.stackexchange.com
  meta.arduino.stackexchange.com
  cs50.stackexchange.com
  meta.cs50.stackexchange.com
  expatriates.stackexchange.com
  expats.stackexchange.com
  meta.expatriates.stackexchange.com
  matheducators.stackexchange.com
  meta.matheducators.stackexchange.com
  meta.stackoverflow.com
  earthscience.stackexchange.com
  meta.earthscience.stackexchange.com
  joomla.stackexchange.com
  meta.joomla.stackexchange.com
  datascience.stackexchange.com
  meta.datascience.stackexchange.com
  puzzling.stackexchange.com
  meta.puzzling.stackexchange.com
  craftcms.stackexchange.com
  meta.craftcms.stackexchange.com
  buddhism.stackexchange.com
  meta.buddhism.stackexchange.com
  hinduism.stackexchange.com
  meta.hinduism.stackexchange.com
  communitybuilding.stackexchange.com
  moderator.stackexchange.com
  moderators.stackexchange.com
  meta.communitybuilding.stackexchange.com
  meta.moderators.stackexchange.com
  startups.stackexchange.com
  meta.startups.stackexchange.com
  worldbuilding.stackexchange.com
  meta.worldbuilding.stackexchange.com
  ja.stackoverflow.com
  jp.stackoverflow.com
  meta.ja.stackoverflow.com
  emacs.stackexchange.com
  meta.emacs.stackexchange.com
  hsm.stackexchange.com
  meta.hsm.stackexchange.com
  economics.stackexchange.com
  meta.economics.stackexchange.com
  lifehacks.stackexchange.com
  meta.lifehacks.stackexchange.com
  engineering.stackexchange.com
  meta.engineering.stackexchange.com
  coffee.stackexchange.com
  meta.coffee.stackexchange.com
  vi.stackexchange.com
  vim.stackexchange.com
  meta.vi.stackexchange.com
  musicfans.stackexchange.com
  meta.musicfans.stackexchange.com
  woodworking.stackexchange.com
  meta.woodworking.stackexchange.com
  civicrm.stackexchange.com
  meta.civicrm.stackexchange.com
  health.stackexchange.com
  meta.health.stackexchange.com
  ru.stackoverflow.com
  hashcode.ru
  stackoverflow.ru
  meta.ru.stackoverflow.com
  meta.hashcode.ru
  rus.stackexchange.com
  russ.hashcode.ru
  russ.stackexchange.com
  meta.rus.stackexchange.com
  mythology.stackexchange.com
  meta.mythology.stackexchange.com
  law.stackexchange.com
  meta.law.stackexchange.com
  opensource.stackexchange.com
  meta.opensource.stackexchange.com
  elementaryos.stackexchange.com
  meta.elementaryos.stackexchange.com
  portuguese.stackexchange.com
  meta.portuguese.stackexchange.com
  computergraphics.stackexchange.com
  meta.computergraphics.stackexchange.com
  hardwarerecs.stackexchange.com
  meta.hardwarerecs.stackexchange.com
  es.stackoverflow.com
  meta.es.stackoverflow.com
  3dprinting.stackexchange.com
  threedprinting.stackexchange.com
  meta.3dprinting.stackexchange.com
  ethereum.stackexchange.com
  meta.ethereum.stackexchange.com
  latin.stackexchange.com
  meta.latin.stackexchange.com
  languagelearning.stackexchange.com
  meta.languagelearning.stackexchange.com
  retrocomputing.stackexchange.com
  meta.retrocomputing.stackexchange.com
  crafts.stackexchange.com
  meta.crafts.stackexchange.com
  korean.stackexchange.com
  meta.korean.stackexchange.com
  monero.stackexchange.com
  meta.monero.stackexchange.com
  ai.stackexchange.com
  meta.ai.stackexchange.com
  esperanto.stackexchange.com
  meta.esperanto.stackexchange.com
  sitecore.stackexchange.com
  meta.sitecore.stackexchange.com
  

• page: esta será la cadena vacía /o /seguida de cualquier cadena

La url será la cadena creada al agregar protocol, domainy pageentre sí, en ese orden.

Casos de prueba

Su expresión regular debe coincidir con:

/codegolf//
http://retrocomputing.stackexchange.com
https://facebook.stackoverflow.com/questions/1234
http://meta.nothingtoinstall.com/thisisa404.php?file=command.com

Su expresión regular no debe coincidir con:

http//codegolf.stackexchange.com/
https://meta.stackoverflow.com.fakesite.dodgy/cgi-bin/virus.cgi?vector=apt
file://www.stackoverflow.com/
http://ripoff.com/stackoverflow.com/q/1234/

Su expresión regular puede coincidir con:

http://panda.stackexchange.com/
https://www.meta.codegolf.stackexchange.com
http://alpha.beta.charlie.delta.chiphacker.com
https://stackexchange.com/sites/

porque son propiedad de Stack Exchange Inc. y, por lo tanto, no serán vulnerables a los ataques XSS.

Este es un desafío de código de golf , por lo que gana la expresión regular más corta.

337 336 333 327 bytes

^https?://([^/]+\.)*(stackoverflow\.(com(\.br)?|ru)|mathoverflow\.(com|net)|hashcode\.ru|((the)?arqade|chiphacker|(mi)?yodeya|ask(ubuntu|different|patents)|(seasoned|brew)advice|s(erverfault|(tack|keptic)exchange|uperuser|tackapps|harepointoverflow|ocialsounddesign)|nothingtoinstall|crossvalidated|basicallymoney)\.com)(/.*)?$

No utiliza ninguna característica elegante de expresiones regulares, por lo que debería funcionar en cualquier sabor de expresión regular.

359 348 bytes

https?:\/\/(([^/]+\.)*((stack(overflow|apps|exchange)|ask(ubuntu|different|patents)|(the)?arqade|serverfault|superuser|nothingtoinstall|(seasoned|brew)advice|crossvalidated|basicallymoney|chiphacker|skepticexchange|(sharepoint|math)overflow|(mi)?yodea|socialsounddesign)\.com)|(stackoverflow(\.com\.br|\.ru)|hashcode\.ru|mathoverflow\.net))(\/.*)?$

Probarlo en RegExr

2179 2092 1966 bytes

https?:\/\/((((www|facebook|jp|(meta\.?)?(es|ru|ja|pt|br)?)\.)?stackoverflow\.com)|(stackoverflow\.(ru|com\.br))|(((russ|meta)\.)?hashcode\.ru)|(crossvalidated|socialsounddesign|mathoverflow|(mi\.?)?yodeya|(www\.)?(sharepointoverflow|basicallymoney)|skepticexchange|brewadvice|(www\.)?chiphacker|ask(different|ubuntu)|stackapps|(meta\.)?(nothingtoinstall|arqade|thearqade|seasonedadvice|superuser|serverfault|ask(ubuntu|patents)))\.com|((meta\.)?mathoverflow\.net)|(((meta\.)?((3|three)dprinting|(ask)?patents|(community|world)building|(econo|acade)mics|(it)?security|(reverse|network)?engineering|a(cademia|i|lcohol|ndroid|nime|pple|rduino|stronomy|viation|vp)|b((e|lend)er|i(cycles?|kes|ology|tcoin)|oardgames?|ricks|uddhism)|c(h(emistry|ess|inese|ristianity)|ivicrm|o(de(review|golf)|ffee|gsci|mputer(science|graphics)|oking)|r(aftcms|afts|ypto(graphy)?)|s(50)?|stheory)|d(ba|eutsch|iy|ranks|rupal|sp)|(earth|data)science|e(books|l(ectronics|ementaryos|l|u)|macs|nglish|spanol|speranto|thereum|xp(at(s|riates)|ressionengine))|f(antasy|itness|re(elancing|nch))|g(a(medev|ming|rage|rdening)|erman|enealogy|is|raphics?designs?|uitars?)|h(am|ealth|ermeneutics|induism|istory|omebrew(ing)?|sm)|(hard|soft)warerecs|islam|italian|j(apanese|oomla|udaism)|korean|l(a((ndscap|nguagelearn)ing|tin|w)|i(fehacks|nguist(ics)?|nux|))|m(a(gento|rtialarts|th(educators|ematica|ematics|s|overflow)?)|eta|echanics|o(derators?|nero|ney|vies)|usic(fans)?|ythology)|o(pen(data|source)|utdoors)|(cycl|parent|retrocomput)ing|p(ets|h(ilosophy|oto(graphy|s)?|ysics)|m|o(ker|litics|rtuguese)|roductivity|rogrammers?|uzzling)|quant|r(aspberrypi|obotics|pg|us(s|sian)?)|s(alesforce|ci(comp|encefiction|fi)|harepoint|ignals|itecore|keptics?|ound(design)?|p(ace|anish|orts)|qa|tartups|tat(s|istics)|ustainability)|t(ex|hefinalfrontier|or|ravel|ridion)|u(buntu|i|nix|x)|vi(deo|m)?|w(eb(apps|masters?)|indowsphone|o(odworking|rdpress|rkplace)|rit(ers?|ing))|(yodeya)))\.stackexchange\.com))(\/|$)

Coincide exactamente con los dominios enumerados y nada más. Hice la mayor parte de la compresión a mano. Estoy un poco avergonzado de haber pasado tanto tiempo en ello.

142 140 334 bytes

#^https?:\/\/([^\/]*\.)?(hashcode\.ru|mathoverflow\.(com|net)|stackoverflow\.(ru|com(\.br)?)|((stack|skeptic)exchange|stackapps|ask(different|patents|ubuntu)|(brew|seasoned)advice|(the)?arqade|basicallymoney|chiphacker|crossvalidated|nothingtoinstall|serverfault|sharepointoverflow|socialsounddesign|superuser|(mi)?yodeya)\.com)(/|$)#

• coincide con todo en los dominios de segundo nivel especificados, ruta o sin ruta
• utiliza #como delimitador para/ no necesita escapar (se guardaron dos bytes)
• comprimido manualmente